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Search: id:A123979
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| A123979 |
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Numbers n for which 12n+1, 12n+5 and 12n+7 are primes. |
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+0
1
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| 1, 3, 8, 16, 23, 38, 51, 71, 73, 108, 141, 156, 166, 178, 198, 233, 271, 288, 346, 376, 451, 453, 471, 478, 646, 656, 773, 778, 786, 871, 926, 1003, 1013, 1031, 1156, 1213, 1311, 1338, 1543, 1576, 1618, 1696, 1751, 1776, 1793, 1846, 1856, 1921, 1933, 1963
(list; graph; listen)
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OFFSET
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1,2
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MAPLE
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a:=proc(n) if isprime(12*n+1)=true and isprime(12*n+5)=true and isprime(12*n+7)=true then n else fi end: seq(a(n), n=1..2800); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 06 2006
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MATHEMATICA
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Select[Range[2000], And @@ PrimeQ /@ ({1, 5, 7} + 12#) &] (*Chandler*)
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CROSSREFS
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Cf. A110801.
Sequence in context: A094357 A136532 A030417 this_sequence A013583 A122794 A115006
Adjacent sequences: A123976 A123977 A123978 this_sequence A123980 A123981 A123982
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Oct 30 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 05 2006
More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Nov 06 2006
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